- Entry:
- CONT
- VIT option:
- SMS
- Event:
- Buffer pool contraction
- VIT processing module:
- ISTRACSM
- Control is returned to:
- ISTORAPX
This trace record is generated whenever VTAM® needs to contract a buffer pool. Buffer
pool contraction will occur when VTAM determines
that it has excess buffers that can be returned to the operating system.
- Byte (hex)
- Contents
- 00–03
- Record ID: C"CONT"
- 04
- ID is the primary address space ID (ASID). This field is 0 if the ASID is greater than X'FF'.
- 05–07
- 0
- 08–0B
- Address of buffer pool control block (BPCB) for which contraction occurred
- 0C–0F
- Address of pool expansion block (PXB) that is contracted
- 10–13
- Extent address (PXBSTADR)
- 14–15
- Number of queued RPHs waiting for expansion
- 16–17
- 0
- 18–1B
- Total number of buffers in pool after this contraction (BPCBTOTL)
- 1C–1F
- Total number of available buffers in pool after this contraction